In 2010 Delfino, was promoted to the Primera División referees crew, being his first game in the top tier of Argentinian football on 9 October 2010 when he took charge of a 1–1 draw between Huracán de Parque Patricios and All Boys. He is part of the Asociación Argentina de Árbitros (in English: Argentine Referees Association), where he lost the 2013 Union Elections.[3]
After a successful 2012, in 2013, Delfino took part in the second leg of the Argentine most important match, the Superclásico. The first game, played on 3 May 2013, ended with a 1–1 draw at La Bombonera. The second one, played on October at the Monumental, ended with a 1–0 to Boca Juniors, who won after a goal scored by Gigliotti in the first half.[4]
- First international match
Delfino's first international game was at La Serena, Chile, in January 2013, when Chile hosted Senegal in a friendly match. It ended 2–1 to the Home team. During the match, he showed seven yellow cards, and two red ones (both for the African team).[5]